Loom crankshaft arrangement



April 1969 F. w. BASSING ETAL 3,441,058

LOOM CRANKSHAFT ARRANGEMENT Filed Oct. 31, 1966 Sheet of s W'MW W "7oat, w Jim April 29, 1969 F. w. BASSIN'G ETAL 3,441,058

LOOM CRANKSHAFT ARRANGEMENT Filed on. 51, 1966 Sheet. 2 of s Fig. 2

,7 5 MAJ April 1969 F. w. BASSING ETAL 3,441,058 v LOOM URANKSHAFTARRANGEMENT Shoot Filed Oct. 51, 1966 Fig. 3

United States Patent 3,441,058 LOOM CRANKSHAFT ARRANGEMENT FriedrichWilhelm Bassiug, 74 Kirschgarten, and Gottfried Gerhard Wilhelm Hofmann,37 Am Baum, both of 205 Hamburg 80, Germany Filed Oct. 31, 1966, Ser.No. 590,705 Claims priority, application Germany, Nov. 5, 1965, B 84,392Int. Cl. D03d 49/60 US. Cl. 139-1 Claims ABSTRACT OF THE DISCLOSURE Thecrankshaft of a loom is located between the harness frame and the raceplate of the slay at the level of the race plate, and is directlyarticulated to the slay.

The invention refers to looms having a slay driven by a crankshaft withmore than two cranks.

In all weaving looms of this type which are known up to now the saidcrankshaft is located behind the harness. This arrangement necessitatesslay connecting means in the form of a linkage extending from theintermediate cranks and crank arms underneath the harness to theintermediate slay swords to drive the slay. To withstand the beat-upload, these slay connecting means have to be of relatively heavyconstruction and thus have the disadvantage of creating vibrations andadditional load by mass acceleration, which limit the working speed ofthese looms.

A further substantial disadvantage of such slay connecting means is thelimitation of free space for the downward motion of the harness. Thisrefers especially to looms with an open-shed dobby, because one orseveral harness frames remain in bottom position during beat-up, andthis means a limitation of the number of harness frames to be used.

All of these disadvantages are eliminated by the present invention by aloom with the main characteristic of having the crankshaft locatedbetween the race plate and the front harness frame thus eliminating theneed for the conventional slay connecting means. Further features of theinvention are a drive shaft which drives a crankshaft, and rotates atthe same speed or at a multiple of its speed and which could carry thepicking cams. As a further feature the centre frames can be of box typeconstruction, housing the cranks 12a with crank arms 13 and the bottompulleys 23 for the motion of harness 8. These centre frames havemounting surfaces 2c at their rear end for the back rest supports andfurther surfaces to carry the frame cross beams, and their sides areprovided to take the bearings for the crankshaft, the drive shaft andthe slay sword pivots.

The characteristics of this invention are illustrated in one of severalpossible executions by the following drawings:

FIG. 1 is a cross-section of the loom, showing a side view of one centreframe assembly,

FIG. 2 is a view of the drive side of the main frame as viewed from theoutside, and

FIG. 3 is a perspective illustration of one centre frame assembly,indicating the attached cross loom components in chain-dotted lines.

The main side frames 1 (see FIG. 1) and one centre frame 2 or severalcentre frames 2 are connected by the cross beam 3, the front rest orbreast beam 4 and the superstructure 5. The warp K is supplied from thewarp beam 6, passes over the back rest 7, through the heddle eyes of theharness 8 and through the reed 9 which is mounted on the race plate 10of the slay. The woven fabric G-passes over the front rest 4 and istaken up by cloth beam 11. According to the invention the crankshaft 12is located between the front harness frame 8a and the race plate 10 anddrives the slay by means of crank arms 13. The race plate 10 is ahorizontal beam carried by the slay swords 14 mounted on swivel pivots14a. The crankshaft 12 is driven by the drive shaft 15. This drive shaft15 -(see FIG. 2) is driven by an electric motor over a reduction geartransmission, both not shown in the drawings. A gear 16' on drive shaft15 drives the intermediate gear 17 which is carried by a stud shaft 18in side frame 1. Furthermore, intermediate gear '17 drives the gear 19on the crankshaft 12. When the drive shaft 15- and the crankshaft 12rotate at the same speed the gears 16 and 19 have an equal number ofteeth. When, however, the drive shaft 15 rotates faster, then the gear16 has correspondingly less teeth than the gear 19 on crankshaft 12.Finally the picking cams 20, for actuating a pick controlling motion ofknown principle which is not shown, may be carried by the drive shaft15. The box type construction of a centre frame 2 is illustrated in FIG.3, whereby the cranks 12a of the crankshaft 12 are located between theside walls 2a and 2b. Each of these walls carries a crankshaft bearing21 from which the crankshaft ends 12b project. Furthermore FIG. 3 showsthe crank link 13 which is pivoted directly at the level of the raceplate 10 to the slay sword 14 with its support 14b for the race plate 10which is located at substantially the same level as the crank shaft 12.

The rear section of the centre frame 2 carries a bearing 22 for thedrive shaft 15, if the crankshaft 12 of a wide loom is driven from bothends, and the surface 20 for mounting the back rest supports which arenot shown. Finally the bottom section of centre frame 2 carries thebottom pulleys 23 for the motion of the harness 8.

The side walls 2a and 2b have locating surfaces 2d and 2e, bores (2 tosupport the cross beams 3, and on the front side of the centre frame 2the locating surface 2g for front rest 4 is provided. The centre frame 2can be preassembled as indicated by solid lines. Furthermore FIG. 3illustrates in chain dotted lines how the cross beams 3, the crankshaft12, the drive shaft 15, the slay swords 14, the race plate 10 and thefront rest 4 are mounted.

Because of elimination of the heavy slay connecting linkage means of theprior art between the crank arms and the slay, which are necessary withconventional wide looms having more than two cranks to drive the slay,the centre of gravity of the entire slay and its slay means swords has afar more favourable location resulting in the further advantage ofrunning. uniformity.

Further, because of the eliminated heavy slay connecting linkage meansthe weight of driven slay parts is considerably reduced whichconsequently results in reduction of vibration caused by acceleration ofa great mass. The connecting pivots between the crank links 13 and theslay swords 14 are arranged at a relatively large distance from slayfoot pivot (14a for a very favourable and short transmission of power.This is an advantageous way of obtaining more beat-up power than withall conventional slay drives. In wide looms, the drive shaft 15,extending over the full loom width, allows to drive the crankshaft 12from both ends, which then can be of smaller diameter than a cna-nkshaft12 that is driven from one end only.

Furthermore, the drive shaft 15 can transmit the more power underconstant load the faster it rotates compared to speed of crankshaft 12.Pick controlling earns 20, fitted to the drive shaft 15, may have lugswhich have the larger a radius curvature the faster the drive shaft 15rotates compared to the speed of crankshaft 12.

Finally, the box type construction of the centre frames 2 has theadvantage of pre-assembling to provide complete units for the finalassembly of looms. The embodiment disclosed in the description and shownin the attached drawings gives only one example of the invention.Structural details can vary without departing from the concept of thepresent invention. So it might be conceivable for instance that the loomis built without superstructure or the drive shaft 15 could be locatedin front of or underneath of harness frames.

We claim:

1. A loom comprising a supporting frame; harness frame means; a slaymounted in front of said h arness frame means for oscillating movementand including slay swords and a race plate between the same; a cnankshaft mounted on said supporting frame in front of said harness framemeans between the same and said race plate at the level of the latterand extending parallel to said race plate, said crank shaft h avingcrank arms; and links located at said level rearward of said slay andhaving ends pivotally connected with said crank arms and said slayswords at the level of said race plate whereby the space forwardly ofsaid slay, rearwardly of said crank Sllflft and below said level isfree, and said crank shaft is spaced a short distance from said slay forthe transmission of power.

2. A loom as claimed in claim 1 wherein said slay comprises more thantwo slay swords and comprising a drive shaft mounted on said supportingframe rearward of said harness frames and extending parallel to saidrace plate and crank shaft over the entire width of the loom; andtransmission means connecting both end portions of said drive shaft withboth end portions of said drive shaft, respectively.

3. A loom as claimed in claim 2 comprising pick controlling cams at saidend portions of said drive shaft.

4. A loom as claimed in claim 2 wherein the ratio of said transmissionis selected so that said drive shaft rotates at least at the rotaryspeed of said crank shaft.

5. A loom as claimed in claim 2 wherein said supporting frame includeslat least one center frame housing comprising side walls through whichsaid crank shaft and said drive shaft pass so that at least the portionof said crank shaft having said crank arms is enveloped by said housing;bearings for said crank shaft and said drive shaft in said side walls;pivot means on said side walls for supporting said slay swords forangular movement; and abutment means on said housing for supporting thebreast beam and the back rest of the loom.

References Cited UNITED STATES PATENTS 1,714,112 5/1929 Stone 139l882,504,939 4/1950 Tuten 139-1 2,533,128 12/1950 Mallard et al. 139-12,835,276 5/1958 Hunt 139-1 744,843 11/1903 Widerstrom 139190 873,60612/1907 Rhoades 139190 HENRY S. IAUDON, Primary Examiner.

U.S. C1. X.R. 139-190

